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formula for date as # day of the gregorian calendar_year (including leap years, excluding leap-seconds)

large to small could go 2021-Jan-02nd. Suppose want it in U.S. style, 01/02/'21, where 01/01 = January 1st = day#1 of the year (2021). 01|31 02|28,29 03|31 04|30 05|31 06|30 07|31 08|31 09|30 10|31 11|...
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4 answers
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Which day of the week will be $100$ days from now

If today is Wednesday, what day of the week will it be $100$ days from now? Going forward $1,8,15,\dots,92,99$ days all result in Wednesday. So the $100$th day will be Thursday. But the solution ...
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